Post-hydration thermal metamorphism of carbonaceous chondrites

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104 Citations (Scopus)

Abstract

The presence of abundant phyllosilicates in many carbonaceous chondrites indicates a prevailing activity of low-temperature aqueous alteration in primitive asteroids. However, among the carbonaceous chondrites known, more than 20 samples show evidence of having been beated at elevated temperatures with corresponding phyllosilicate dehydration. The mineralogical features of dehydration suggest that the beating occured in situ in meteorites, which demonstrates that there are some hydrated asteroids that have been heated at a certain period after aqueous alteration. Recent studies have uncovered details of heating and dehydration processes in hydrous carbonaceous chondrites: step-by-step changes in mineralogy, trace element chemistry, carbonaceous materials, and reflectance spectra have been clarified. Based on data from synchrotron X-ray diffraction analysis of the matrix, heated hydrous carbonaceous chondrites have been classified as Stages I-IV, with the temperature of heating increasing from I to IV. In spite of recent progress, heat sources are poorly defined, mainly due to a lack of chronological information on the timing of the heating, and therefore more data are needed to fully clarify the thermal metamorphism of hydrous carbonaceous chondrites.

Original languageEnglish
Pages (from-to)260-272
Number of pages13
JournalJournal of Mineralogical and Petrological Sciences
Volume100
Issue number6
DOIs
Publication statusPublished - 2005 Dec
Externally publishedYes

Keywords

  • Dehydration
  • Hydrous carbonaceous chondrites
  • Serpentine
  • Thermal metamorphism

ASJC Scopus subject areas

  • Geophysics
  • Geology

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